CN112822583A - Method for eliminating call echo of bone conduction earphone - Google Patents
Method for eliminating call echo of bone conduction earphone Download PDFInfo
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- CN112822583A CN112822583A CN202011560517.8A CN202011560517A CN112822583A CN 112822583 A CN112822583 A CN 112822583A CN 202011560517 A CN202011560517 A CN 202011560517A CN 112822583 A CN112822583 A CN 112822583A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
- G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Telephone Function (AREA)
Abstract
The application discloses a method for eliminating call echo of a bone conduction headset, which relates to the technical field of bone conduction headsets and comprises the following steps: a conversation echo cancellation (AEC) module is implanted in the earphone; includes steps S1-S7 and steps A1-A5. The invention adopts the design of a built-in call echo cancellation (AEC) module, an echo cancellation module and the like, when in call, a call microphone of the earphone collects a near-end external audio signal, meanwhile, the echo cancellation module in the earphone collects a received far-end voice digital signal as a reference signal for echo cancellation, and the voice post-processing module carries out post-processing, including operations of frequency response (EQ) adjustment, gain adjustment, dynamic range compression and the like.
Description
Technical Field
The application relates to the technical field of bone conduction earphones, in particular to a method for eliminating call echo of a bone conduction earphone.
Background
Bone conduction is a sound conduction mode, that is, sound is converted into mechanical vibration with different frequencies, and sound waves are transmitted through the skull, the bone labyrinth, the lymph fluid of the inner ear, the spiral organ and the auditory center of a human body. Compared with a classical sound conduction mode of generating sound waves through a vibrating diaphragm, the bone conduction mode omits a plurality of sound wave transmission steps, can realize clear sound restoration in a noisy environment, and does not influence other people due to the fact that the sound waves are diffused in the air. The bone conduction technology is divided into a bone conduction speaker technology and a bone conduction microphone technology:
1. bone conduction speaker technology is used for speech, i.e. listening to sound. The air conduction speaker converts an electric signal into a sound wave (vibration signal) and transmits the sound wave to an auditory nerve. The bone conduction speaker is a sound wave (vibration signal) converted from an electric signal and directly transmitted to the auditory nerve through the bone. The transmission medium of the sound wave (vibration signal) is different; 2. bone conduction microphone technology is used for receiving, i.e. collecting, sound. The air conduction speech is that sound waves are transmitted to the microphone through air, and the bone conduction speech is directly transmitted through bones; headphones manufactured using these bone conduction technologies are called bone conduction headphones, and are also called bone conduction headphones, bone sensing headphones, and bone sensing headphones.
In a specific use process, the bone conduction earphone conducts sound by means of vibration of the vibrator, and sound leakage often occurs; when a call is made, the call microphone receives a missing sound and generates an echo, so that a method for eliminating the call echo of the bone conduction headset is needed, and the echo of the bone conduction headset during the call is reduced by combining software and hardware.
Disclosure of Invention
The invention aims to provide a method for eliminating the call echo of a bone conduction earphone, which is characterized in that a call echo elimination (AEC) module, an echo elimination module and the like are arranged in the earphone, when in call, a call microphone of the earphone collects a near-end external audio signal, meanwhile, the echo elimination module in the earphone collects a received far-end voice digital signal as a reference signal for echo elimination, and a voice post-processing module performs post-processing comprising operations such as frequency response (EQ) adjustment, gain adjustment, dynamic range compression and the like
The embodiment of the application provides a method for eliminating a call echo of a bone conduction earphone, which comprises the following steps:
a conversation echo cancellation (AEC) module is implanted in the earphone; during communication, a communication microphone of the earphone collects a near-end external audio signal, an echo cancellation module in the earphone collects a received far-end voice digital signal as a reference signal for echo cancellation, and the echo cancellation module cancels echo in a sending signal through an algorithm;
also comprises the following steps:
step S1, the earphone enters a communication mode, and a communication microphone of the earphone picks up a near-end external sound signal;
step S2, digitizing the voice signals collected by each microphone;
step S3, the conversation voice receiving module receives the digital signal sent by the far end, carries out pretreatment including frequency response (EQ) adjustment, gain adjustment, dynamic range compression and the like, and sends the signal to the power amplifier;
step S4, sending the amplified voice signal to a loudspeaker;
step S5, the echo cancellation module picks the received far-end voice digital signal as the reference signal of echo cancellation, and the picking point is set before the signal amplification of the power amplifier or after the signal amplification;
step S6, the echo eliminating module eliminates the echo in the sending voice signal through an algorithm and then sends the echo to the post-processing module;
step S7, the voice post-processing module performs post-processing including frequency response (EQ) adjustment, gain adjustment and dynamic range compression, and then outputs;
the method also comprises the basic steps of a call echo cancellation (AEC) module:
step A1: the signal s (n) at the far end passes through an adaptive filter to generate signals e to (n), and the signal s (n) is simultaneously emitted at the near end through a loudspeaker;
step A2: picking up unwanted echo signals e (n) by a near-end call microphone;
step A3: under the condition that only the far-end speaks, e to (n) and e (n) generate a residual echo signal r (n) after passing through a subtracter;
step A4: the adaptive filter utilizes the residual echo signal and adopts an algorithm to adjust the coefficient of the adaptive filter, thereby eliminating the residual echo;
step A5: the back-lifting elimination module adopts a self-adaptive digital filter and a finite-length impulse response (FIR) filter, and an NLMS algorithm comprises the following steps:
the output of the filter:
estimation error:
e(n)＝d(n)-y(n)
updating of the weight vector:
the embodiment of the application adopts the following technical scheme: in step S1, one or more microphones of the earphone are set.
The embodiment of the application adopts the following technical scheme: in step S2, the voice signal collected by each microphone is a digital signal directly output by the digital microphone.
The embodiment of the application adopts the following technical scheme: in step S2, the voice signal collected by each microphone is converted into an analog signal for the analog microphone, and then a digital signal is generated.
The embodiment of the application adopts the following technical scheme: the method for converting the analog signal comprises the following steps: the MCU carries out conversion by the ADC and uses a special audio processing chip for conversion.
The embodiment of the application adopts the following technical scheme: in step S4, the speaker is provided as a vibrator.
The embodiment of the application adopts the following technical scheme: in step S4, the speaker is set as a horn.
The embodiment of the application adopts the following technical scheme: in step S5, the echo cancellation module recovers the received far-end speech digital signal as a reference signal for echo cancellation, and the recovery point is set before the signal amplification of the power amplifier as the recovery signal 1.
The embodiment of the application adopts the following technical scheme: the echo cancellation module recovers the received far-end voice digital signal as a reference signal of echo cancellation, and a recovery point is arranged on a signal of the power amplifier and is a recovery signal 2 after the signal is amplified.
The embodiment of the application adopts the following technical scheme: in step A5, in the formula of NLMS algorithm, x (n) is the far-end speech input signal vector at n time,
for the adaptive filter, d (n) is the actual echo signal.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
the invention adopts the design of a built-in call echo cancellation (AEC) module, an echo cancellation module and the like, when in call, a call microphone of the earphone collects a near-end external audio signal, meanwhile, the echo cancellation module in the earphone collects a received far-end voice digital signal as a reference signal for echo cancellation, and the voice post-processing module carries out post-processing, including operations of frequency response (EQ) adjustment, gain adjustment, dynamic range compression and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic diagram of a method for eliminating echo in a bone conduction headset call according to the present invention;
fig. 2 is a schematic diagram illustrating the principle of the bone conduction headset call echo according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Examples
A method of bone conduction headset talk echo cancellation, comprising:
a conversation echo cancellation (AEC) module is implanted in the earphone; during communication, a communication microphone of the earphone collects a near-end external audio signal, an echo cancellation module in the earphone collects a received far-end voice digital signal as a reference signal for echo cancellation, and the echo cancellation module cancels echo in a sending signal through an algorithm;
also comprises the following steps:
step S1, the earphone enters a communication mode, and a communication microphone of the earphone picks up a near-end external sound signal;
step S2, digitizing the voice signals collected by each microphone;
step S3, the conversation voice receiving module receives the digital signal sent by the far end, carries out pretreatment including frequency response (EQ) adjustment, gain adjustment, dynamic range compression and the like, and sends the signal to the power amplifier;
step S4, sending the amplified voice signal to a loudspeaker;
step S5, the echo cancellation module recovers the received far-end voice digital signal as a reference signal for echo cancellation, and the recovery point is set before signal amplification of the power amplifier (recovery signal (r)) or after signal amplification (recovery signal (r)), as shown in fig. 1;
step S6, the echo eliminating module eliminates the echo in the sending voice signal through an algorithm and then sends the echo to the post-processing module;
step S7, the voice post-processing module performs post-processing including frequency response (EQ) adjustment, gain adjustment and dynamic range compression, and then outputs;
through the design of a built-in call echo cancellation (AEC) module, an echo cancellation module and the like, when in call, a call microphone of the earphone collects a near-end external audio signal, meanwhile, the echo cancellation module in the earphone recovers a received far-end voice digital signal as a reference signal for echo cancellation, and the voice post-processing module performs post-processing including frequency response (EQ) adjustment, gain adjustment, dynamic range compression and other operations
The method also comprises the basic steps of a call echo cancellation (AEC) module:
step A1: the signal s (n) at the far end passes through an adaptive filter to generate signals e to (n), and the signal s (n) is simultaneously emitted at the near end through a loudspeaker;
step A2: picking up unwanted echo signals e (n) by a near-end call microphone;
step A3: under the condition that only the far-end speaks, e to (n) and e (n) generate a residual echo signal r (n) after passing through a subtracter;
step A4: the adaptive filter utilizes the residual echo signal and adopts an algorithm to adjust the coefficient of the adaptive filter, thereby eliminating the residual echo;
step A5: the back-lifting elimination module adopts a self-adaptive digital filter and a finite-length impulse response (FIR) filter, and an NLMS algorithm comprises the following steps:
the output of the filter:
estimation error:
e(n)＝d(n)-y(n)
updating of the weight vector:
in the formula of NLMS algorithm, x (n) is the far-end speech input signal vector at n time,
for the adaptive filter, d (n) is the actual echo signal.
In step S1, one or more microphones of the earphone are set; in step S2, the voice signal collected by each microphone is a digital signal directly output by a digital microphone; in step S2, the voice signal collected by each microphone is converted into an analog signal for the analog microphone, and then a digital signal is generated.
The method for converting the analog signal comprises the following steps: the MCU carries out conversion by the ADC and uses a special audio processing chip for conversion.
In step S4, the speaker is set as a vibrator; in step S4, the speaker is set as a horn.
In step S5, the echo cancellation module recovers the received far-end speech digital signal as a reference signal for echo cancellation, and the recovery point is set before the signal amplification of the power amplifier as a recovery signal 1; the echo cancellation module recovers the received far-end voice digital signal as a reference signal of echo cancellation, and a recovery point is arranged on a signal of the power amplifier and is a recovery signal 2 after the signal is amplified.
In summary, the following steps: the earphone enters a call mode, and a call microphone of the earphone picks up a near-end external sound signal; digitizing the voice signals collected by each microphone; the call voice receiving module receives a digital signal sent by a far end, performs pretreatment including frequency response (EQ) adjustment, gain adjustment, dynamic range compression and the like, and sends the digital signal to a power amplifier; the amplified voice signal is sent to a loudspeaker; the echo cancellation module is used for acquiring the received far-end voice digital signal as a reference signal for echo cancellation, and an acquisition point is arranged before signal amplification of a power amplifier (acquisition signal I) or after the signal amplification (acquisition signal II); the echo cancellation module cancels echoes in the sent voice signals through an algorithm and then sends the echoes to the post-processing module; the voice post-processing module performs post-processing including frequency response (EQ) adjustment, gain adjustment and dynamic range compression, and then outputs;
the signal s (n) at the far end passes through an adaptive filter to generate signals e to (n), and the signal s (n) is simultaneously emitted at the near end through a loudspeaker; picking up unwanted echo signals e (n) by a near-end call microphone; under the condition that only the far-end speaks, e to (n) and e (n) generate a residual echo signal r (n) after passing through a subtracter; the adaptive filter utilizes the residual echo signal and adopts an algorithm to adjust the coefficient of the adaptive filter, thereby eliminating the residual echo; the echo cancellation module adopts a self-adaptive digital filter and a finite-length impulse response (FIR) filter, and cancels the call echo through an NLMS algorithm;
the invention adopts the design of a built-in call echo cancellation (AEC) module, an echo cancellation module and the like, when in call, a call microphone of the earphone collects a near-end external audio signal, meanwhile, the echo cancellation module in the earphone collects a received far-end voice digital signal as a reference signal for echo cancellation, and the voice post-processing module carries out post-processing, including operations of frequency response (EQ) adjustment, gain adjustment, dynamic range compression and the like.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method for echo cancellation in a bone conduction headset call, comprising:
a conversation echo cancellation (AEC) module is implanted in the earphone; during communication, a communication microphone of the earphone collects a near-end external audio signal, an echo cancellation module in the earphone collects a received far-end voice digital signal as a reference signal for echo cancellation, and the echo cancellation module cancels echo in a sending signal through an algorithm;
also comprises the following steps:
step S1, the earphone enters a communication mode, and a communication microphone of the earphone picks up a near-end external sound signal;
step S2, digitizing the voice signals collected by each microphone;
step S3, the conversation voice receiving module receives the digital signal sent by the far end, carries out pretreatment including frequency response (EQ) adjustment, gain adjustment, dynamic range compression and the like, and sends the signal to the power amplifier;
step S4, sending the amplified voice signal to a loudspeaker;
step S5, the echo cancellation module picks the received far-end voice digital signal as the reference signal of echo cancellation, and the picking point is set before the signal amplification of the power amplifier or after the signal amplification;
step S6, the echo eliminating module eliminates the echo in the sending voice signal through an algorithm and then sends the echo to the post-processing module;
step S7, the voice post-processing module performs post-processing including frequency response (EQ) adjustment, gain adjustment and dynamic range compression, and then outputs;
the method also comprises the basic steps of a call echo cancellation (AEC) module:
step A1: the signal s (n) at the far end passes through an adaptive filter to generate signals e to (n), and the signal s (n) is simultaneously emitted at the near end through a loudspeaker;
step A2: picking up unwanted echo signals e (n) by a near-end call microphone;
step A3: under the condition that only the far-end speaks, e to (n) and e (n) generate a residual echo signal r (n) after passing through a subtracter;
step A4: the adaptive filter utilizes the residual echo signal and adopts an algorithm to adjust the coefficient of the adaptive filter, thereby eliminating the residual echo;
step A5: the back-lifting elimination module adopts a self-adaptive digital filter and a finite-length impulse response (FIR) filter, and an NLMS algorithm comprises the following steps:
the output of the filter:
estimation error:
e(n)＝d(n)-y(n)
updating of the weight vector:
2. the method for echo cancellation in a bone conduction headset call as claimed in claim 1, wherein in step S1, one or more microphones of the headset are set.
3. The method for echo cancellation in a bone conduction earphone phone call as claimed in claim 1, wherein in step S2, the voice signals collected by each microphone are digital signals directly output by a digital microphone.
4. The method for echo cancellation in a bone conduction earphone phone call as claimed in claim 1, wherein in step S2, the voice signal collected by each microphone is converted into an analog signal for an analog microphone to generate a digital signal.
5. The method of claim 3 or 4, wherein the method for converting the analog signal comprises: the MCU carries out conversion by the ADC and uses a special audio processing chip for conversion.
6. The method for echo cancellation in a bone conduction earphone call as claimed in claim 1, wherein in step S4, the speaker is configured as a vibrator.
7. The method for echo cancellation in a bone conduction headset call as claimed in claim 6, wherein in step S4, the speaker is configured as a speaker.
8. The method of claim 1, wherein in step S5, the echo cancellation module recovers the received far-end speech digital signal as a reference signal for echo cancellation, and the recovery point is set before the signal amplification of the power amplifier as a recovery signal 1.
9. The method of claim 2, wherein the echo cancellation module recovers the received far-end speech digital signal as a reference signal for echo cancellation, and the recovery point is set at the signal amplification of the power amplifier to obtain the recovery signal 2.
10. The method of claim 1, wherein in step A5, in the formula of NLMS algorithm, x (n) is the far-end speech input signal vector at n time,
for the adaptive filter, d (n) is the actual echo signal.
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| CN202011560517.8A CN112822583A (en) | 2020-12-25 | 2020-12-25 | Method for eliminating call echo of bone conduction earphone |
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| CN202011560517.8A CN112822583A (en) | 2020-12-25 | 2020-12-25 | Method for eliminating call echo of bone conduction earphone |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113676816A (en) * | 2021-09-26 | 2021-11-19 | 惠州市欧迪声科技有限公司 | Echo eliminating method for bone conduction earphone and bone conduction earphone |
| CN116723437A (en) * | 2023-08-08 | 2023-09-08 | 深圳市鑫正宇科技有限公司 | Echo cancellation method for bone conduction earphone |
-
2020
- 2020-12-25 CN CN202011560517.8A patent/CN112822583A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113676816A (en) * | 2021-09-26 | 2021-11-19 | 惠州市欧迪声科技有限公司 | Echo eliminating method for bone conduction earphone and bone conduction earphone |
| CN116723437A (en) * | 2023-08-08 | 2023-09-08 | 深圳市鑫正宇科技有限公司 | Echo cancellation method for bone conduction earphone |
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